Ben B. Beckendorf

Jazz blues is a hybrid idiom that merges the expressive, melodic language and 12‑bar song forms of the blues with the harmony, improvisational vocabulary, and rhythmic feel of jazz. Typically, it retains a blues structure (often the 12‑bar form) while enriching it with jazz devices such as ii–V progressions, secondary dominants, turnarounds, tritone substitutions, and extended chords (9ths, 11ths, 13ths). The feel commonly swings, with walking bass lines, comping on piano or guitar, blue notes, call‑and‑response phrasing, and solos that mix blues scales with mixolydian and bebop lines. The result ranges from earthy shuffles to urbane, harmonically sophisticated vehicles for improvisation, sitting comfortably between New Orleans roots, Kansas City riff traditions, and modern bop language.

Blues is an African American musical tradition defined by expressive "blue notes," call-and-response phrasing, and a characteristic use of dominant-seventh harmony in cyclical song forms (most famously the 12‑bar blues). It is as much a feeling as a form, conveying sorrow, resilience, humor, and hard-won joy. Musically, blues commonly employs the I–IV–V progression, swung or shuffled rhythms, and the AAB lyric stanza. Melodies lean on the minor/major third ambiguity and the flattened fifth and seventh degrees. Core instruments include voice, guitar (acoustic or electric), harmonica, piano, bass, and drums, with slide guitar, bends, and vocal melismas as signature techniques. Over time the blues has diversified into regional and stylistic currents—Delta and Piedmont country blues, urban Chicago and Texas blues, West Coast jump and boogie-woogie—while profoundly shaping jazz, rhythm & blues, rock and roll, soul, funk, and much of modern popular music.